Epithelial cells are more likely to become cancerous than other tissue cells because epithelial cells ____
a. lack a nucleus
b. are always exposed to the external environment
c. are only found in simple tissues
d. undergo DNA replication more often
e. have an extensive blood vascular system
ANSWER: d
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Which of the following points on the phylogeny shown above depicts the most recent common ancestor of Animals and Microsporidians?
A. 1 B. 2 C. 3 D. 4 E. 5
Which of the following does not contribute to the infectious ability of prions?
A. prion proteins are not digested B. prion proteins can induce the misfolding of normal proteins C. prion proteins can enter the bloodstream D. prion proteins are deposited as aggregates E. prion diseases progress slowly
____ is the tendency of water molecules to stay
attached to one another.
a. Adhesion b. Cohesion c. Fusion d. Interaction e. Junction
Yeasts are able to communicate with each other
A) by close cell-to-cell contact. B) through chemical signaling. C) only if they can touch each other and have merged cell walls.